JOCO cups are made from high quality, non-porous, borosilicate glass. They are lightweight and resistant to extreme changes in temperature. Their Superior durability makes them microwave and dishwasher safe. JOCO cups are 100% BPA free, lead free and cadmium free making them the supreme choice for your reusable glass cup. JOCO silicone lids are splash safe and the specially designed JOCO Nose Dome feature ensures no more embarrassing nose to lid collisions. JOCO cups are fitted with a silicone sleeve to ensure your coffee stays steamy and your hands cool. JOCO cups are modeled after standard 8, 12 and 16 oz disposable takeaway cup sizes.